Leaking Or Damaged Components Except A/C Compressor, Reservoir Or Receiver/Dryer

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The refrigerant circuit was completely empty (for example with larger leak or cracked hose)

NOTE:

In the event of only a minor leak with slow escape of refrigerant (e.g. at a small leakage point), the amount of refrigerant oil lost and the amount of moisture penetrating is not sufficient to influence operation of the air conditioner.

The operations marked * are only to be implemented in case of a major leak (e.g. following an accident).

Electrically-Driven A/C Compressor

-- Remove the faulty component. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).

-- Remove the electrically driven A/C compressor and flush. Refer to ELECTRICALLY DRIVEN A/C COMPRESSOR, RINSING (REMOVE REFRIGERANT OIL) *.

-- Clean the refrigerant circuit (flush with Refrigerant R134a). Refer to REFRIGERANT CIRCUIT, CLEANING (FLUSHING), WITH REFRIGERANT R134A *.

-- Fill the A/C compressor or the refrigerant circuit with completely with refrigerant oil to the specified capacity.

Mechanically Driven A/C Compressor

-- Remove the faulty component. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).

-- Remove the A/C compressor. Refer to A/C Compressor Regulator ValveN280, Removing and Installing A/C System, General Information [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] A/C Pressure/Temperature Sensor G395, Removing and Installing [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] A/C System Temperature Door Heat Output Activation, Checking (vehicle-specific repair information)*

-- Remove the oil drain plug -B- / -D- from the A/C compressor -A-.*

Fig 1: Identifying Removal Of Oil Drain Plug -B- / -D- From A/C Compressor -A-

Courtesy of AUDI OF AMERICA, LLC

NOTE:

There are different versions of the oil drain plug -B- / -D- and seal -C- / -E- (depending on the A/C compressor manufacturer).

Pay close attention to the tightening specification for the oil drain plug -B- / -D- (depending on the A/C compressor manufacturer and the oil drain plug version). Refer to A/C System, General Information (vehicle-specific repair information).

A/C compressors made by "Denso" and "Nippondenso" have an oil drain plug -D-, for example, with a seal -E- installed on it.

A/C compressors made by "Sanden" or "Zexel" have an oil drain plug -B-, for example, with an O-ring -C- already installed.

To accelerate drainage of refrigerant oil, rotate the A/C compressor by way of clutch plate of A/C clutch, for example.

Drain the old refrigerant oil from the A/C compressor.

All

NOTE:

Then fill A/C compressor with quantity of fresh refrigerant oil corresponding to quantity of refrigerant oil in replacement A/C compressor. Refer to APPROVED REFRIGERANT OILS AND CAPACITIES .*

Use different refrigerant oils and quantities for the various compressors. Refer to APPROVED REFRIGERANT OILS AND CAPACITIES .

To ensure compressor lubrication on start-up, at least 40 cm³ of refrigerant oil must be poured into the compressor. The remainder can be added to the new reservoir or receiver/dryer. Refer to APPROVED REFRIGERANT OILS AND CAPACITIES .

If dirt has penetrated into the compressor with the refrigerant circuit open (for example after an accident), compressor is to be replaced.

Clean refrigerant circuit (flush with refrigerant R134a (Refer to REFRIGERANT CIRCUIT, CLEANING (FLUSHING), WITH REFRIGERANT R134A .) or blow through with compressed air and nitrogen (Refer to REFRIGERANT CIRCUIT, FLUSHING WITH COMPRESSED AIR AND NITROGEN .)*

-- Replace dryer cartridge*, receiver/dryer* or accumulator* and restrictor. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).

-- Assemble, evacuate and recharge refrigerant circuit.

Refrigerant circuit still contains refrigerant (for example, with minor leak)

-- Discharge the refrigerant circuit.

-- Remove the malfunctioning component, flush with compressed air, collect escaping refrigerant oil.

-- The new component is to be filled with the amount of refrigerant oil flushed out (positive 20 cm³ for evaporator, positive 10 cm³ for condenser, refrigerant lines and refrigerant hoses) as fresh refrigerant oil fill.

-- Replace the restrictor. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).

-- Assemble, evacuate and charge the refrigerant circuit.